I am trying just a basic program with OpenCV with the following code:
#include "cv.h"
#include "highgui.h"
int main()
{
IplImage* newImg;
newImg = cvLoadImage("~/apple.bmp", 1);
cvNamedWindow("Window", 1);
cvShowImage("Window", newImg);
cvWaitKey(0);
cvDestroyWindow("Window");
cvReleaseImage(&newImg);
return 0;
}
When I run this, I get
The program can't start because
libcxcore200.dll is missing from your
computer. Try reinstalling the
program to fix this problem.
However, I can see this DLL. It exists. I have added the following to the input dependencies for my linker
C:\OpenCV2.0\lib\libcv200.dll.a
C:\OpenCV2.0\lib\libcvaux200.dll.a
C:\OpenCV2.0\lib\libcxcore200.dll.a
C:\OpenCV2.0\lib\libhighgui200.dll.a
What gives? I'm using visual studio 2008.
When I link the .dll files instead of .dll.a files, I get
fatal error LNK1107:invalid or corrupt
file: cannot read at 0x3F8
libcv200.dll
I followed instructions on http://opencv.willowgarage.com/wiki/VisualC%2B%2B_VS2010 but was still stuck on exactly the same problem, so here's how I resolved it.
Fetched MSVC 2010 express edition.
Fetched Win 32 OpenCV 2.2 binaries and installed in default location.
Created new project.
Project setup
Project -> OpenCV_Helloworld Properties...Configuration Properties -> VC++ Directories
Include Directories... add: C:\OpenCV2.2\include\;
Library Directories... add: C:\OpenCV2.2\lib;C:\OpenCV2.2\bin;
Source Directories... add:
C:\OpenCV2.2\modules\calib3d\src;C:\OpenCV2.2\modules\contrib\src;C:\OpenCV2.2\modules\core\src;C:\OpenCV2.2\modules\features2d\src;C:\OpenCV2.2\modules\flann\src;C:\OpenCV2.2\modules\gpu\src;C:\OpenCV2.2\modules\gpu\src;C:\OpenCV2.2\modules\highgui\src;C:\OpenCV2.2\modules\imgproc\src;C:\OpenCV2.2\modules\legacy\src;C:\OpenCV2.2\modules\ml\src;C:\OpenCV2.2\modules\objdetect\src;C:\OpenCV2.2\modules\video\src;
Linker -> Input -> Additional Dependencies...
For Debug Builds... add:
opencv_calib3d220d.lib;opencv_contrib220d.lib;opencv_core220d.lib;opencv_features2d220d.lib;opencv_ffmpeg220d.lib;opencv_flann220d.lib;opencv_gpu220d.lib;opencv_highgui220d.lib;opencv_imgproc220d.lib;opencv_legacy220d.lib;opencv_ml220d.lib;opencv_objdetect220d.lib;opencv_video220d.lib;
At this point I thought I was done, but ran into the problem you described when running the exe in debug mode. The final step is obvious once you see it, select:
Linker -> General ... Set 'Use Library Dependency Inputs' to 'Yes'
Hope this helps.
Just add C:\OpenCV2.0\bin into your PATH environment variable
or
When you install OpenCV,
Choose the option, Add OpenCV to the system PATH for current user which is not default one
Just for your information,after add the "PATH",for my win7 i need to reboot it to get it work.
In Visual Studio 2013 you need to add this to the Environment Variables and then Restart your pc. This is the path where .dll file located in.
I have had numerous problems with opencv and only succeded after a gruesome 4-6 months. This is the last problem I have had, but all of the above didn't work. What worked for me was just copying and pasting the opencv_core2*.dll (and opencv_highgui2*.dll which it will ask for since you included this as well) into the release (or debug folder - I'm assuming. Haven't tested this) folder of your project, where your application file is.
Hope this helps!
You just need to add the folder of the needed dll file (or files) to your system "Environment Variables" in "Path".
Your problem will 100% be resolved. I had this problem too.
just open the bin folder and copy and paste the .dll files to the folder you are working in..it should fix the problem
As to #Marc's answer, I don't think VC uses the path from the OS. Did you add the path to VC's library paths. I usually add the DLLs to the project and copy if newer on the build and that works very well for me.
you can find the opencv_core248 and other dlls in opencv\build\x86\vc12\bin folder. Just copy the dlls you require into system32 folder. And your app should start working in a flash ! Hope it helps.
This might be like resurrecting a dead horse. But just so it's out there, the reason why the answer to these types of questions to simply put dll's into the system32 folder is because that folder is in the os's system path.
It's actually best practice to provide the os with a path link.
With windows 10
open up file explorer
right click on "this pc" and select "properties"
Now in the "Control Panel\System and Security\System" window that comes up, click on "Advanced System Settings" from the left hand panel.
At the bottom of the next window, click on the "Environment Variables" button.
On the next window, there are two panels, the top one is for modifying variables to the current user, and the bottom panel is for modifying variables to the system. On the bottom panel, find the variable "Path" and click it to select it, then click on the "edit" button.
Here you can then create, edit, delete, or update the different paths for the system. For example, to add mingw32-make to the system so you can access that command via command prompt, click new, then paste in the path to the bin. Example path, "D:\Qt\Tools\mingw730_64\bin", no quotation marks nor additional whitespaces.
Click ok on all the windows so that the changes are saved, then reboot your computer for the changes to be loaded.
The ".a" at the end of your DLL files is a problem, and those are there because you didn't use CMAKE to build OpenCV 2.0. Additionally you do not link to the DLL files, you link to the library files, and again, the reason you do not see the correct library files is because you didn't use CMAKE to build OpenCV 2.0. If you want to use OpenCV 2.0 you must build it for it to work correctly in Visual Studio. If you do not want to build it then I would suggest downgrading to OpenCV 1.1pre, it comes pre-built and is much more forgiving in Visual Studio.
Another option (and the one I would recommend) is to abandon OpenCV and go with EmguCV. I have been playing with OpenCV for about a year and things got much easier when I switched to EmguCV because EmguCV works with .NET, so you can use a language like C# that does not come with all the C++ baggage of pointers, header files, and memory allocation problem.
And as for the question of 64bit vs. 32bit, OpenCV does not officially support 64bit. To be on the safe side open your project properties and change the "Platform Target" under the "Build" tab from "Any CPU" to "X86". This should be done any time you do anything with OpenCV, even if you are using a wrapper like EmguCV.
Copy all .dll from /bin in System32
Just copy the .dll files to C:\windows\system32\
No need to do any of that. It is a visual studio error.
just go here:
http://connect.microsoft.com/VisualStudio/Downloads/DownloadDetails.aspx?DownloadID=31354
and download the appropriate fix for your computer's OS
close visual studio, run the fix and then restart VS
The code should run without any error.
I have been writing C++ code snippets sporadically to speed things up in R via Rcpp, but now I would like to do more using Armadillo library, but I am having trouble installing it.
The README file instructs to create a location for "include" folder and tell your compiler to use that location for header files (in addition to the locations it uses already).
If I save the "include" folder into C:\Users\me\Documents\ARMADILLO, then how do I instruct the compiler to use the appropriate location?
After some search, I tries typing into command line the following (after prompt: C:\Users\me>):
g++ Documents\ARMADILLO\include, but it did not work ("permission denied"). I hence wonder how this should be done.
Moreover, the README file finally instructs to: Configure your compiler to link with LAPACK and BLAS - I would very much appreciate an advice how this should be done as well.
Thanks a lot!
PS: I have Windows 7 and VS Express 2013 for Desktop.
Visual Studio uses solutions which are containers of projects. Each project has a settings page (right click the project in the Solution Explorer window). Under "Configuration properties" there's a VC++ Directories page, which in turn lists "Include Directories". Append ;C:\Users\me\Documents\ARMADILLO
BTW, I find it useful to put such libs under C:\libs\. Saves on path length.
I am new with visual studio, opencv.
I am using visual studio 2013, opencv and c++ for my project.
I configured (copied path) the opencv and other library to my computer environment system.
After run the project in visual studio, normally, there will be an exe file in the project.
I can copy the exe file in the project folder and copy to other place in my computer and it will run normally.
This is because my computer environment systems are configured with opencv and other library.
I want to do the same thing with other computers BUT I do not want to manually configure each computer with opencv and other libraries.
Are there any ways that I can do to link everythings all in exe file after run the project in visual studio 2013 so that I can run the exe without depend on the path of libaries and opencv?
EDITED
I use opencv installer opencv2.4.7.exe
In the current VS2013 my project, i configured my project and opencv installer as this link
http://www.anlak.com/using-opencv-2-4-x-with-visual-studio-2010-tutorial/
question : Can i use the library in folder C:\opencv\build\x64\vc11\staticlib come from the opencv installer no need create my own library from source opencv?
question : In case i need to generate new library from opencv source (http://docs.opencv.org/doc/tutorials/introduction/windows_install/windows_install.html) or use lib in static folder of opencv installer, if i want to include it all to exe files, do i need to create new project and reconfigure?
Thank you.
First you need to rebuild openCV to generate static libraries instead of dynamically linked ones. This way all code that your application uses is thrown together in one single exe-file (which will probably be significantly bigger). This exe-file you can move to other computers and they should still work there, provided they have an architecture that is at least compatible with yours. So if you build it on an x86 perconal computer (32-bit), it should basically work on any other personal computer. If you build it on a x64 computer (AMD 64-bit), it will only run on other x64 machines. At least this is true assuming both systems use the same syscall API (Windows NT, POSIX...).
For openCV you do this by setting the BUILD_SHARED_LIBS build flag to false (see OpenCV as a static library (cmake options), the following line is taken from there):
cmake -DBUILD_SHARED_LIBS=OFF ..
Once you have done this, you will see that the openCV folder looks very similar to the one you have now, except that in your 'lib' folder there will now be .lib-files instead of .dll files (at least if you are working on Windows, which I assume you do since you are using Visual Studio).
Next step is to go to your project settings and set your linker to link with the static libraries instead of the dynamically ones. If you have used openCV's local method for linking, you can go to project settings -> linker -> input -> Addtional dependencies. There you change the extension of all the openCV libraries from .dll to .lib.
Now you should be able to rebuild your application and the resulting exe-file should have all dependent libraries contained in it.
I have problem with installing OpenCV under Windows 7 x64. Following this. Downloaded executable and ran it. But I do not see any bin folder, instead there are 2 folders: build and source. What to do next I do not know, what to include to system path and how?
Note:
I am not using visual c++, instead I use devcpp editor.
The OpenCV windows installer comes as a self-extraction program. It essentially packs everything including the source files, docs, and most importantly, the pre-compiled files.
The pre-compiled files are located in build, and sources files are located in source. If you are intented to use opencv libraries solely, all you need to do is to
add build/include/ into your IDE additional include list.
selectively add build/lib/.. into the additional link list according to your vs version.
add build/bin/ to your system PATH, so your program can find them.
I have downloaded c++ open source application which was created using under Linux IDE/Editor (or maybe something NOT Windows) and its no longer supported.
This time I want to edit and recompile it using VS 2010.
Error(s) left (mostly prefixed with "wx") such as:
"wxString is undefined"
"wxStaticText expected a type specifier"
etc... makes me think that this is all about wxWidgets.
After successfully building wxWidgets, what to do next to integrate it to the actual c++ program for me to be able to edit and compile using VS 2010?
I use BorlandC++ last 2 years ago but not familiar with GUI packages.
The first step is to tell the compiler where to look for the wxWidgets include files.
So, you need to find out where these files are, which depends on where you installed and built wxWidgets.
On my system, this is C:\Program Files (x86)\wxWidgets-2.8.12
I consider the best way is to, instead of hard-coding the path in every project, create an environment variable WXROOT to store the path to your wxWidgets folder.
Control Panel | System | Advanced | Environment variables
Now you have to tell the compiler about this
Visual Studio | Project | Properties | C/C++ | Additional Include Directories
What you add here depends on what kind of build you are doing. If you are doing a unicode release build, then this will be a good start
"$(WXROOT)\lib\vc_lib\mswu";"$(WXROOT)\include"
Now you should have fixed your compiler errors.
Next you will get some linker errors ....
Maybe the errors are caused because you are using wxwidget 2.8 which is unsupported in VS 2010.
Try building wxwidgets 2.9 or use VS 2008. I had no problem building wxwidgets 2.9 on VS 2010.
Wxwidgets site home says "While this is still officially a development release because some API details are still not frozen, we believe that 2.9.3 can be used in production environment".
About what to do after successfully build it, take a look at this http://wiki.wxwidgets.org/Microsoft_Visual_C%2B%2B_Guide
You may want to use the tutorial of the section "Creating a new project from a sample" 'cause creating a project by hand is a little bit complicated as wxwidgets requires some extra configuration and not just to set and include and libs dir as most of the libs does.
Here is a video which shows how to start with Visual Studio.
Also you can take a look at samples directory and create your own project based on configuration of projects from that directory.
May be I am little bit late , But this will help newcomers to wxwidgets.
First of all Goto Wxwidgets directory(to download path) in my case it is "C:\Users\WxWidgets_all".
Now in that folder goto build directory.Now open Visual Studio Command prompt. If you have already installed Visual Studio then you can easily find it through start menu.
Now in command prompt go upto <Path to your wxWidgets>/build/msw/ . Now run Following Commands.
nmake /f makefile.vc--For Static Library and Debug Version
nmake /f makefile.vc SHARED=1--For SHARED Library and Debug Version
nmake /f makefile.vc BUILD=release--For SHARED Library and Release Version
After completing it , you will have dll or lib in "<path to wxwidgets>\lib\" depending on option provided in above commands.
Now include all files related to wxwidgets in your project.Mainly two paths are required to include "<path to wxwidgets>\inlcude\" and "<path to wxwidgets>\lib\vc_<lib\dll>".
After that link your wxwidgets generated library to your project.To do this inlcude "<path to wxwidgets>\lib\vc_<lib\dll>" to your project property in library section.
Now add below preprocessors to your project.
_WINDOWS
NDEBUG(For Release)
_DEBUG(For Debug)
_CRT_SECURE_NO_DEPRECATE=1
_CRT_NON_CONFORMING_SWPRINTFS=1
_SCL_SECURE_NO_WARNINGS=1
__WXMSW__
_UNICODE
After that add following library to your project from "<path to wxwidgets>\lib\vc_<lib\dll>"
wxbase30u_net
wxmsw30u_core
wxbase30u
wxtiff
wxjpeg
wxpng
wxzlib
wxregexu
wxexpat
wxmsw30u_adv
Based on your compiled options , library name can be little bit different.
I think I have covered all the steps to run wxWidgets.
Even if you got errors , You can check minimal project in "<path to wxwidgets>\samples"
directory. Try to run that project , and even if you got error then your wxwidgets is not built properly.
Hope this will help.